Help! Time Machine Not Showing Backup despite hard drive showing 300 GB backup file

I'm trying to access a Time Machine backup from 3 years ago. However when I click on my external drive (1TB), it's empty. When I run Disk Utility, it shows 302 GB is currently in use, which is the back-up. When I try to restore, the backup does not appear in macOS recovery.

After running first aid on the external drive, these were the results:

Running First Aid on “My Passport for Mac” (disk4s2)

Checking file system and repairing if necessary and if possible.

Volume was successfully unmounted.

Performing fsck_apfs -y -x /dev/rdisk4s2

Checking the container superblock.

Checking the checkpoint with transaction ID 1291.

Checking the space manager.

Checking the space manager free queue trees.

Checking the object map.

Checking volume /dev/rdisk4s2.

Checking the APFS volume superblock.

The volume My Passport for Mac was formatted by diskmanagementd (1677.81.1) and last modified by apfs_kext (2235.80.4.0.1).

Checking the object map.

Checking the snapshot metadata tree.

Checking the snapshot metadata.

Checking the fsroot tree.

Checking the extent ref tree.

Verifying volume object map space.

Verifying allocated space.

The volume /dev/rdisk4s2 with UUID 84CDB5FD-7442-4F87-BDF4-C7DB6628784C appears to be OK.

File system check exit code is 0.

Restoring the original state found as mounted.

Operation successful.

Here is info on drive:

Volume name : My Passport for Mac

Volume type : APFS Volume

BSD device node : disk4s2

Mount point : /Volumes/My Passport for Mac

File system : APFS (Case-sensitive)

Connection : USB

Device tree path : IODeviceTree:/PCI0@0/XHC1@14

Writable : Yes

Is case-sensitive : Yes

File system UUID : 84CDB5FD-7442-4F87-BDF4-C7DB6628784C

Volume capacity : 2,000,021,315,584

Available space (Purgeable + Free) : 1,690,473,095,168

Purgeable space : 0

Free space : 1,690,473,095,168

Used space : 309,248,397,312

File count : 624,801

Owners enabled : Yes

Is encrypted : No

System Integrity Protection supported : No

Can be verified : Yes

Can be repaired : Yes

Bootable : No

Journaled : No

Disk number : 4

Partition number : 2

Media name :

Media type : Generic

Ejectable : Yes

Solid state : No

S.M.A.R.T. status : Not Supported

Parent disks : disk4

Any suggestions on how I can access this Time Machine backup? It's quite frustrating because I have only found one post online with a similar issue, but no resolution. Thanks!